The angles of a triangle add to 180 degrees so the remaining angle must be 90°.
This triangle is half a square. It's one of the two tired triangles of trig, the other being half an equilateral triangle, 30°/60°/90°.
Answer:
90
Step-by-step explanation:
1 triangle=180 45+45-90
90+90=180
the 3rd one is the graph answer
Nine plus a unknown number equals unknown.
(<em>x</em>, <em>y</em>) represent coordinates, <em>m</em> represents slope, and <em>b</em> represents the y-intercept
